33 Rissoa membranacea.

33 Rissoa membranacea.

Thick, ribbed shell with ribs overhanging the suture (1) . Tooth-like protuberance on the columella (2) . Shell height 5.6 mm. Beached. Silverstrand, Co. Galway, Ireland. September 2002. Leg. J. Fisher, in coll. S. Taylor.

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